Patent GB-369190-A (GB)
Title: Method of and means for determining the introduction of a sound record in an accompanying picture film
IPC: G03B31/00
Filed: 1930-09-10
Abstract: 369,190. Associated working of gramophones with kinematographs. SIEMENS & HALSKE AKT.-GES., Siemensstadt, Berlin. Sept. 10, 1930, No. 27069. Convention date, Sept. 11, 1929. Void [Published under Sect. 91 of the Acts]. [Class 40 (ii).] Relates to devices whereby, during the projection of kinematograph pictures, accompanied by sound-reproduction from gramophone records, the gramophone or gramophones may be automatically started at the proper time or times. According to the invention, during the taking of the pictures, the images on the picture film are numbered consecutively, and auxiliary number-printing mechanism is at the same time synchronously driven. At the instant when a sound-recording machine is put into operation, the printing mechanism automatically records, e.g. on a paper strip, a number corresponding to that given to the picture image which is being recorded at that moment. Where several sound-recording machines are used simultaneous. ly or in succession during the taking of the pictures (the same number of gramophones being similarly used subsequently during projection of the pictures) each sound record is individually numbered, and these record numbers are also printed. The prints so obtained of the record numbers and the picture numbers may be stuck on the appropriate records. The duplicate picture films are also provided with attachments, perforations, or equivalent devices arranged adjacent to the picture images denoted by the numbers that have been printed as described above, and such devices are adapted to actuate switches for effecting the starting of the gramophones, so that the starting of each of the latter machines occurs exactly when required. Fig. 1 shows the mechanism for printing the numbers on a paper strip 18. A motor 1, running synchronously with another motor (not shown) driving the kinematograph apparatus, film-marking device, and soundrecording machines, drives through 1 : 10 reduction gearing 4, 5 printing mechanism operating like a counter, of which only the unit type wheel 7 is shown. Each type wheel has a hammer 9 coacting therewith, the hammers being mounted on spring-pressed angle levers 10 rotatable on a common axis 11 ; the ends of all the longer limbs of the levers 10 are adapted to be held as shown in full lines, by the end 13 of the armature 14 of an electromagnet B. Projections 19 on the levers 10 coact with a cam 20 on a shaft 21. This shaft is rotated through a single revolution when a magnet K is momentarily energized, the armature 28 of the magnet, when attracted, serving to interpose a gear wheel 25 between a wheel 24 on the shaft 21 and a wheel 30 driven by the motor 1. A notched disc 34 on the spindle of the wheel 25, coacting with a fixed pin 35, ensures that the wheel 25 makes a complete revolution when it has been moved into gear with the wheel 30, disengagement of the gears after one revolution being effected by the pull of the spring 29 on the bell-crank armature lever 26. The single revolution of the shaft 21 thus effected causes the cam 20, by acting on the projections 19, to shift the levers 10 from the dotted-line to the full-line position, stressing the springs 12. At the same time, the strip 18 is fed along between the hammers 9 and the type wheels by rubber rollers 43, 44. Means for inking the types are provided, preferably by a carbon ribbon inserted with the paper band. Close to the number wheel 7 is a printing piece 36 which carries as many numbers in a row as there are recording machines. A printing hammer 37 for coacting with the numbers of the type 36, is carried by an armature lever 38 of an electromagnet P. A cam 23 on the shaft 21 normally closes contacts K6, and another cam 22 normally closes contacts K5. When a sound-recording machine is started, a contact device thereon (not shown) closes a circuit through a relay, and this completes a circuit through the contacts K5, K6 whereby the corresponding magnet P is energized. The number denoting the record then being made is thus printed by the mechanism 36, 37. At the same time a polarized relay is operated, and shifts a contact which allows a charged condenser to discharge through the magnet B. This occurs when, as the motor shaft 2 revolves, a cam 3 thereon opens contacts K2 (in circuit with the polarized relay) and closes contacts K3, which are in circuit with the magnet B. The temporary energizing of the magnet B so produced causes the armature 14 to release the printing hammers 9, and the appropriate picture-number is thereby printed. Movement of the hammers closes contacts K4, in circuit with the magnet K. This operates as described above, to cause a revolution of the shaft 21, so that the printing hammers 9 are reset and the tape 18 is shifted. The contacts K5, K6 controlled by the cams 22, 23 are opened shortly after the beginning of the revolution of the shaft 21, so that should an impulse from another recording machine arrive whilst the movements effected by the shaft are occurring, no further printing then occurs. The arrangement of the relays is, however, such that such an impulse is effective as soon as the next number on the printing mechanism 7 is in correct position. Shortly before the completion of the revolution of the shaft 21, the cam 22 allows contact K7 to close, whereby the armature of the polarized relay is reset to its original position. Slow-acting relays are also provided in such a manner as to prevent repeat printings. Indicating lamps are arranged to show when a printing operation effected by any one sound-recording machine has taken place. When these lamps are switched off, the circuits of the relays associated therewith are simultaneously restored to their normal conditions. Fig. 2 (not shown), is a circuit diagram showing the manner in which the relays and the various contact devices are associated.